Improvement in staples



ATENT OFFICE.

BYRON BOARDMAN, OF NORWICH, CONNECTICUT.

IMPROVEMENT IN STAPLES.

Specification forming part of Letters Patent No. 54,283, dated May1,1866.

To all whom it may concern:

Be it known that I, BYRON BOARDMAN, of Norwich, in the county of NewLondon and State of Connecticut, have invented a new and ImprovedStaple, for which I desire to obtain a patent, as for a new manufacture;and the following is a clear and exact description of my said invention,which will be more fully understood by reference to the accompanyingdrawings, in which- Figures l and 2 represent views of said staple. Fig.3 is a modification thereof. Fig. 4 is a cross-section, and Fig. 5 showsthe mode of its application.

My invention consists in a staple having that part which is vd esignedto enter the wood swaged in to longitudinal grooves or corruga tions, asshown in Figs. I, 3, and 4, for the purpose of giving increased strengthto the staple and at the same time furnishing an eX- tended ribbedsurface, which will form corresponding indentations in the wood when thestaple is driven and prevent its becoming loose in the wood whensubjected to lateral strain, as in workin g the slats of window-blinds 5also, in forming transverse ribs across the grooves by interceptin g thefurrows at intervals, and allowing the metal at the point ofinterruption to assume the forni ot' a rib or ridge across thelongitudinal grooves for the purpose of taking a better hold upon thewood in order to resist being Withdrawn.

The mode of constructing the staple is as follows: Having been bent intothe proper shape the branches thereof are subjected to an impressionfrom dies ofthe proper construction and swaged into the form desired.Previous to the operation of swaging I usually scarf or bevel the endsof the branches upon opposite sides in such amanner that the action ofthe dies will produce acute edges or points, which should be so shapedas readily to penetrate the wood without previously boring the same.There should be ribs left atl proper intervals across the longitudinalfurrows of the4 staples, which should be much more tapering at the lowerside of the ridge than at the upper, so as to offer comparatively littleresistance in driving, but retaining a firm hold of the wood when oncedriven in, to prevent its being withdrawn.` These ribs are formed bycutting away a portion of the ridges in the swaging-dies at properintervals, which causes the surface of the staple at such points to takethe form of transverse ribs as the lon gil tudinal grooves are stampedupon the branches of the staple.

These staples are principally intended for window-blinds or screens, butmay be made of a larger or smaller size to adapt them to a great varietyof uses. The corrugations may be of various shapes and made .upon one orboth branches of the staple, and may be interrupted at any point to formtransverse ribs whenever desired 5 or the longitudinal corrugations maybe made upon one side of each branch of the staple andthe transversecorrugations upon the other side, or other permutations may beintroduced at the pleasure of the in an ufacturer.v

I am aware that spikes, bolts, and staples have been bearded by beingcut or jagged by means of a chisel or otherwise, a portion of the metalbeing' elevated thereby and forming transverse barbs, and especially bybeing cut or nicked at the corners or angles for the purpose of holdingwith greater tenacity when driven into wood. These, therefore, I do notclaim. Neither do I now cla-im a staple formed with transverse furrowsupon the branches by swaging, as they have been so constructed under mypatent of March 30,1858. I am also aware that nails or spikes have beenmade with longitudinal grooves extending uninterruptedly throughout thegreater portion of their entire length and without transverse ridges. Iam also acquainted with Harveys patent of 1833, for a spike withlongitudinal ribs having transverse ridges in the intervals betweenthese ribs, which are so far depressed below the ribs that they cannottake effectual hold upon the bers of the wood into which they aredriven. None of these, therefore, do I now claim, nor do I claim thelike contrivances when applied to a staple; but

What I do claim as new and desire to secure by Letters Patent, as a newmanufacture or vendible commodity, is

A staple provided with longitudinal grooves or corrugations, incombination with transverse ribs elevated to about the same height abovethe body of the staple as are the corrugations,

the whole being so shaped as to be capable of being formed by swagingmachinery, for thepurposes and substantially in the form above

